Circular Operator Iris Localization Algorithm Based on Two-dimensional Wavelet Transform
Zhao Jing · Computer Technology and Development · 2013
An improved iris localization algorithm of circular operator based on two-dimensional wavelet transform is proposed to improve the accuracy and the speed of the iris localization.Firstly,the algorithm segments the pupil area of the iris by the threshold.Secondly it locates the iris inner edge by the edge detection operator in the pupil area.Thirdly the human eye iris image is processed by the two-dimensional wavelet transform to reduce the image resolution instead of the smoothing function in the Daugman circular operator.Finally it gets the circular edge of the sliding window by the circular edge detection operator,and compares the circle inside mean gray with the circle outside mean gray to locate the iris outer edge.The simulation results show that the algorithm locates the iris inner and outer edge with 1.85s average time and 99.6% accuracy rate.The algorithm has a higher practical value in the iris recognition system.